Oolong Tea and Doppio are produced all around the globe. And they change according to region in where they are cultivated. So, the question arises what is Oolong Tea and Doppio's differentiating factor?In following section we will take a close look at what is Oolong Tea and Doppio color, serving style, types and much more. First thing to know is what are the different types of Oolong Tea and Doppio. Well, Oolong Tea types include Yu Lan Xiang, Xing Ren Xiang, Zhi Lan Xiang, Po Tou Xiang, Huang Zhi Xiang, You Hua Xiang while types of Doppio are Espresso.